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#![feature(test)]
extern crate test;
use test::Bencher;
// Static/dynamic method dispatch
struct Struct {
field: isize,
}
trait Trait {
fn method(&self) -> isize;
}
impl Trait for Struct {
fn method(&self) -> isize {
self.field
}
}
#[bench]
fn trait_vtable_method_call(b: &mut Bencher) {
let s = Struct { field: 10 };
let t = &s as &dyn Trait;
b.iter(|| t.method());
}
#[bench]
fn trait_static_method_call(b: &mut Bencher) {
let s = Struct { field: 10 };
b.iter(|| s.method());
}
// Overhead of various match forms
#[bench]
fn option_some(b: &mut Bencher) {
let x = Some(10);
b.iter(|| match x {
Some(y) => y,
None => 11,
});
}
#[bench]
fn vec_pattern(b: &mut Bencher) {
let x = [1, 2, 3, 4, 5, 6];
b.iter(|| match x {
[1, 2, 3, ..] => 10,
_ => 11,
});
}
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